<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable="false"
        show-icon
      >
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            expand-trigger="hover"
            :options="cateList"
            :props="cateProps"
            v-model="selectedKeys"
            @change="handleChange"
            change-on-select
            clearable
          >
          </el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisable"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数的数据表格 -->
          <el-table :data="manyTableData" border>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  closable
                  v-for="(item, i) of scope.row.attr_vals"
                  :key="i"
                  @close="handelClose(i, scope.row)"
                >
                  {{ item }}
                </el-tag>
                <!-- 可编辑标签 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisable"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态属性的数据表格 -->
          <el-table :data="onlyTableData" border>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  closable
                  v-for="(item, i) of scope.row.attr_vals"
                  :key="i"
                  @close="handelClose(i, scope.row)"
                >
                  {{ item }}
                </el-tag>
                <!-- 可编辑标签 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <el-form
        ref="addFormRef"
        :model="addForm"
        :rules="addFormRules"
        label-width="80px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 编辑参数对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form
        ref="editFormRef"
        :model="editForm"
        :rules="editFormRules"
        label-width="80px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      // 商品分类
      cateList: [],
      //选中项的cat_id数组
      selectedKeys: [],
      //数据的配置信息
      cateProps: {
        //数据源parantList中的cat_id做数据绑定
        value: "cat_id",
        //数据源parantList的cat_name渲染出来的内容
        label: "cat_name",
        //数据源parantList的children做嵌套
        children: "children"
      },
      //   被激活的页签的名称
      activeName: "many",
      manyTableData: [],
      onlyTableData: [],
      addDialogVisible: false,
      // 添加参数/属性的表单
      addForm: {
        attr_name: ""
      },
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: "请输入参数名称",
            trigger: "blur"
          }
        ]
      },
      editDialogVisible: false,
      editForm: {},
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: "请输入参数名称",
            trigger: "blur"
          }
        ]
      }
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类列表数据失败！");
      }

      this.cateList = res.data;
      //   console.log(this.cateList);
    },
    // 级联选择框发生变化会触发这个函数
    handleChange() {
      this.getParamsData();
    },
    // tab 页签点击事件的处理函数
    handleTabClick() {
      // console.log(this.activeName);
      this.getParamsData();
    },
    async getParamsData() {
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
        return;
      }
      // console.log(this.selectedKeys);
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes
`,
        { params: { sel: this.activeName } }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取分类参数数据失败！");
      }

      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
        item.inputVisible = false;
        item.inputValue = "";
      });
      console.log(res.data);
      if (this.activeName === "many") {
        this.manyTableData = res.data;
      } else {
        this.onlyTableData = res.data;
      }
    },
    // 监听对话框关闭事件函数
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    // 添加分类处理函数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        );
        if (res.meta.status !== 201) {
          return this.$message.error("添加分类失败！");
        }
        this.$message.success("添加分类成功！");
        this.addDialogVisible = false;
        this.getParamsData();
      });
    },
    // 点击编辑图标按钮展现编辑对话框
    async showEditDialog(attr_id) {
      const {
        data: res
      } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        { params: { attr_sel: this.activeName } }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("查找参数失败！");
      }
      this.editForm = res.data;
      this.editDialogVisible = true;
    },
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return;
        const {
          data: res
        } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("修改参数失败！");
        }
        this.$message.success("修改参数成功！");
        this.editDialogVisible = false;
        this.getParamsData();
      });
    },
    async removeParams(attr_id) {
      const confirmText = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning"
        }
      ).catch(err => err);

      //确定为：confirm；取消为：cancel
      if (confirmText !== "confirm") {
        return this.$message.info("已取消删除！");
      }

      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      );
      if (res.meta.status !== 200) {
        return this.$message.error("删除参数失败！");
      }
      this.$message.success("删除参数成功！");
      this.getParamsData();
    },
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        row.inputVisible = false;
        return;
      }
      row.attr_vals.push(row.inputValue);
      row.inputVisible = false;
      row.inputValue = "";
      this.saveAttrVals(row);
    },
    showInput(row) {
      row.inputVisible = true;
      // 文本框自动获得焦点
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(" ")
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("修改参数项失败！");
      }
      this.$message.success("修改参数项成功！");
    },
    handelClose(i, row) {
      row.attr_vals.splice(i, 1);
      this.saveAttrVals(row);
    }
  },
  computed: {
    //   如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisable() {
      if (this.selectedKeys.length !== 3) {
        return true;
      }
      return false;
    },
    // 当前选中的三级分类的id
    cateId() {
      if (this.selectedKeys.length === 3) {
        return this.selectedKeys[2];
      }
      return null;
    },
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      } else {
        return "静态属性";
      }
    }
  }
};
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin-right: 15px;
}
.input-new-tag {
  width: 120px;
}
</style>
